Implement JsonPath in JsonReader.
This commit is contained in:
Jesse Wilson
parent
80bbf4a85a
commit
fbc7e69c81
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@ -272,6 +272,17 @@ public class JsonReader implements Closeable {
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stack[stackSize++] = JsonScope.EMPTY_DOCUMENT;
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}
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/*
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* The path members. It corresponds directly to stack: At indices where the
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* stack contains an object (EMPTY_OBJECT, DANGLING_NAME or NONEMPTY_OBJECT),
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* pathNames contains the name at this scope. Where it contains an array
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* (EMPTY_ARRAY, NONEMPTY_ARRAY) pathIndices contains the current index in
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* that array. Otherwise the value is undefined, and we take advantage of that
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* by incrementing pathIndices when doing so isn't useful.
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*/
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private String[] pathNames = new String[32];
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private int[] pathIndices = new int[32];
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/**
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* Creates a new instance that reads a JSON-encoded stream from {@code in}.
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*/
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@ -333,10 +344,11 @@ public class JsonReader implements Closeable {
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}
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if (p == PEEKED_BEGIN_ARRAY) {
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push(JsonScope.EMPTY_ARRAY);
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pathIndices[stackSize - 1] = 0;
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peeked = PEEKED_NONE;
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} else {
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throw new IllegalStateException("Expected BEGIN_ARRAY but was " + peek()
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+ " at line " + getLineNumber() + " column " + getColumnNumber());
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+ " at line " + getLineNumber() + " column " + getColumnNumber() + " path " + getPath());
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}
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}
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@ -354,7 +366,7 @@ public class JsonReader implements Closeable {
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peeked = PEEKED_NONE;
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} else {
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throw new IllegalStateException("Expected END_ARRAY but was " + peek()
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+ " at line " + getLineNumber() + " column " + getColumnNumber());
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+ " at line " + getLineNumber() + " column " + getColumnNumber() + " path " + getPath());
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}
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}
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@ -372,7 +384,7 @@ public class JsonReader implements Closeable {
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peeked = PEEKED_NONE;
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} else {
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throw new IllegalStateException("Expected BEGIN_OBJECT but was " + peek()
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+ " at line " + getLineNumber() + " column " + getColumnNumber());
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+ " at line " + getLineNumber() + " column " + getColumnNumber() + " path " + getPath());
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}
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}
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@ -387,10 +399,11 @@ public class JsonReader implements Closeable {
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}
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if (p == PEEKED_END_OBJECT) {
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stackSize--;
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pathNames[stackSize] = null; // Free the last path name so that it can be garbage collected!
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peeked = PEEKED_NONE;
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} else {
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throw new IllegalStateException("Expected END_OBJECT but was " + peek()
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+ " at line " + getLineNumber() + " column " + getColumnNumber());
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+ " at line " + getLineNumber() + " column " + getColumnNumber() + " path " + getPath());
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}
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}
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@ -783,9 +796,10 @@ public class JsonReader implements Closeable {
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result = nextQuotedValue('"');
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} else {
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throw new IllegalStateException("Expected a name but was " + peek()
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+ " at line " + getLineNumber() + " column " + getColumnNumber());
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+ " at line " + getLineNumber() + " column " + getColumnNumber() + " path " + getPath());
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}
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peeked = PEEKED_NONE;
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pathNames[stackSize - 1] = result;
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return result;
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}
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@ -819,9 +833,10 @@ public class JsonReader implements Closeable {
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pos += peekedNumberLength;
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} else {
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throw new IllegalStateException("Expected a string but was " + peek()
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+ " at line " + getLineNumber() + " column " + getColumnNumber());
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+ " at line " + getLineNumber() + " column " + getColumnNumber() + " path " + getPath());
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}
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peeked = PEEKED_NONE;
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pathIndices[stackSize - 1]++;
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return result;
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}
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@ -839,13 +854,15 @@ public class JsonReader implements Closeable {
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}
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if (p == PEEKED_TRUE) {
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peeked = PEEKED_NONE;
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pathIndices[stackSize - 1]++;
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return true;
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} else if (p == PEEKED_FALSE) {
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peeked = PEEKED_NONE;
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pathIndices[stackSize - 1]++;
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return false;
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}
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throw new IllegalStateException("Expected a boolean but was " + peek()
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+ " at line " + getLineNumber() + " column " + getColumnNumber());
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+ " at line " + getLineNumber() + " column " + getColumnNumber() + " path " + getPath());
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}
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/**
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@ -862,9 +879,10 @@ public class JsonReader implements Closeable {
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}
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if (p == PEEKED_NULL) {
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peeked = PEEKED_NONE;
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pathIndices[stackSize - 1]++;
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} else {
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throw new IllegalStateException("Expected null but was " + peek()
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+ " at line " + getLineNumber() + " column " + getColumnNumber());
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+ " at line " + getLineNumber() + " column " + getColumnNumber() + " path " + getPath());
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}
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}
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@ -885,6 +903,7 @@ public class JsonReader implements Closeable {
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if (p == PEEKED_LONG) {
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peeked = PEEKED_NONE;
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pathIndices[stackSize - 1]++;
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return (double) peekedLong;
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}
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@ -897,17 +916,18 @@ public class JsonReader implements Closeable {
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peekedString = nextUnquotedValue();
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} else if (p != PEEKED_BUFFERED) {
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throw new IllegalStateException("Expected a double but was " + peek()
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+ " at line " + getLineNumber() + " column " + getColumnNumber());
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+ " at line " + getLineNumber() + " column " + getColumnNumber() + " path " + getPath());
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}
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peeked = PEEKED_BUFFERED;
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double result = Double.parseDouble(peekedString); // don't catch this NumberFormatException.
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if (!lenient && (Double.isNaN(result) || Double.isInfinite(result))) {
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throw new MalformedJsonException("JSON forbids NaN and infinities: " + result
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+ " at line " + getLineNumber() + " column " + getColumnNumber());
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+ " at line " + getLineNumber() + " column " + getColumnNumber() + " path " + getPath());
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}
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peekedString = null;
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peeked = PEEKED_NONE;
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pathIndices[stackSize - 1]++;
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return result;
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}
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@ -929,6 +949,7 @@ public class JsonReader implements Closeable {
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if (p == PEEKED_LONG) {
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peeked = PEEKED_NONE;
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pathIndices[stackSize - 1]++;
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return peekedLong;
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}
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@ -940,13 +961,14 @@ public class JsonReader implements Closeable {
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try {
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long result = Long.parseLong(peekedString);
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peeked = PEEKED_NONE;
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pathIndices[stackSize - 1]++;
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return result;
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} catch (NumberFormatException ignored) {
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// Fall back to parse as a double below.
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}
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} else {
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throw new IllegalStateException("Expected a long but was " + peek()
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+ " at line " + getLineNumber() + " column " + getColumnNumber());
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+ " at line " + getLineNumber() + " column " + getColumnNumber() + " path " + getPath());
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}
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peeked = PEEKED_BUFFERED;
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@ -954,10 +976,11 @@ public class JsonReader implements Closeable {
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long result = (long) asDouble;
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if (result != asDouble) { // Make sure no precision was lost casting to 'long'.
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throw new NumberFormatException("Expected a long but was " + peekedString
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+ " at line " + getLineNumber() + " column " + getColumnNumber());
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+ " at line " + getLineNumber() + " column " + getColumnNumber() + " path " + getPath());
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}
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peekedString = null;
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peeked = PEEKED_NONE;
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pathIndices[stackSize - 1]++;
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return result;
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}
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@ -1151,9 +1174,10 @@ public class JsonReader implements Closeable {
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result = (int) peekedLong;
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if (peekedLong != result) { // Make sure no precision was lost casting to 'int'.
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throw new NumberFormatException("Expected an int but was " + peekedLong
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+ " at line " + getLineNumber() + " column " + getColumnNumber());
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+ " at line " + getLineNumber() + " column " + getColumnNumber() + " path " + getPath());
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}
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peeked = PEEKED_NONE;
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pathIndices[stackSize - 1]++;
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return result;
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}
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@ -1165,13 +1189,14 @@ public class JsonReader implements Closeable {
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try {
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result = Integer.parseInt(peekedString);
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peeked = PEEKED_NONE;
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pathIndices[stackSize - 1]++;
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return result;
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} catch (NumberFormatException ignored) {
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// Fall back to parse as a double below.
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}
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} else {
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throw new IllegalStateException("Expected an int but was " + peek()
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+ " at line " + getLineNumber() + " column " + getColumnNumber());
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+ " at line " + getLineNumber() + " column " + getColumnNumber() + " path " + getPath());
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}
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peeked = PEEKED_BUFFERED;
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@ -1179,10 +1204,11 @@ public class JsonReader implements Closeable {
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result = (int) asDouble;
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if (result != asDouble) { // Make sure no precision was lost casting to 'int'.
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throw new NumberFormatException("Expected an int but was " + peekedString
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+ " at line " + getLineNumber() + " column " + getColumnNumber());
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+ " at line " + getLineNumber() + " column " + getColumnNumber() + " path " + getPath());
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}
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peekedString = null;
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peeked = PEEKED_NONE;
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pathIndices[stackSize - 1]++;
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return result;
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}
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@ -1232,13 +1258,22 @@ public class JsonReader implements Closeable {
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}
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peeked = PEEKED_NONE;
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} while (count != 0);
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pathIndices[stackSize - 1]++;
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pathNames[stackSize - 1] = "null";
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}
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private void push(int newTop) {
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if (stackSize == stack.length) {
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int[] newStack = new int[stackSize * 2];
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int[] newPathIndices = new int[stackSize * 2];
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String[] newPathNames = new String[stackSize * 2];
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System.arraycopy(stack, 0, newStack, 0, stackSize);
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System.arraycopy(pathIndices, 0, newPathIndices, 0, stackSize);
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System.arraycopy(pathNames, 0, newPathNames, 0, stackSize);
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stack = newStack;
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pathIndices = newPathIndices;
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pathNames = newPathNames;
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}
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stack[stackSize++] = newTop;
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}
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@ -1431,6 +1466,37 @@ public class JsonReader implements Closeable {
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+ " at line " + getLineNumber() + " column " + getColumnNumber();
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}
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/**
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* Returns a <a href="http://goessner.net/articles/JsonPath/">JsonPath</a> to
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* the current location in the JSON value.
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*/
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public String getPath() {
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StringBuilder result = new StringBuilder().append('$');
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for (int i = 0, size = stackSize; i < size; i++) {
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switch (stack[i]) {
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case JsonScope.EMPTY_ARRAY:
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case JsonScope.NONEMPTY_ARRAY:
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result.append('[').append(pathIndices[i]).append(']');
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break;
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case JsonScope.EMPTY_OBJECT:
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case JsonScope.DANGLING_NAME:
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case JsonScope.NONEMPTY_OBJECT:
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result.append('.');
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if (pathNames[i] != null) {
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result.append(pathNames[i]);
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}
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break;
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case JsonScope.NONEMPTY_DOCUMENT:
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case JsonScope.EMPTY_DOCUMENT:
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case JsonScope.CLOSED:
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break;
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}
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}
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return result.toString();
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}
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/**
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* Unescapes the character identified by the character or characters that
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* immediately follow a backslash. The backslash '\' should have already
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@ -1503,7 +1569,7 @@ public class JsonReader implements Closeable {
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*/
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private IOException syntaxError(String message) throws IOException {
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throw new MalformedJsonException(message
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+ " at line " + getLineNumber() + " column " + getColumnNumber());
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+ " at line " + getLineNumber() + " column " + getColumnNumber() + " path " + getPath());
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}
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/**
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@ -1547,7 +1613,8 @@ public class JsonReader implements Closeable {
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reader.peeked = PEEKED_UNQUOTED;
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} else {
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throw new IllegalStateException("Expected a name but was " + reader.peek() + " "
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+ " at line " + reader.getLineNumber() + " column " + reader.getColumnNumber());
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+ " at line " + reader.getLineNumber() + " column " + reader.getColumnNumber()
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+ " path " + reader.getPath());
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}
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}
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};
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@ -0,0 +1,176 @@
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/*
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* Copyright (C) 2014 Google Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.google.gson.stream;
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import java.io.IOException;
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import java.io.StringReader;
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import junit.framework.TestCase;
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public class JsonReaderPathTest extends TestCase {
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public void testPath() throws IOException {
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JsonReader reader = new JsonReader(
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new StringReader("{\"a\":[2,true,false,null,\"b\",{\"c\":\"d\"},[3]]}"));
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assertEquals("$", reader.getPath());
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reader.beginObject();
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assertEquals("$.", reader.getPath());
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reader.nextName();
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assertEquals("$.a", reader.getPath());
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reader.beginArray();
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assertEquals("$.a[0]", reader.getPath());
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reader.nextInt();
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assertEquals("$.a[1]", reader.getPath());
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reader.nextBoolean();
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assertEquals("$.a[2]", reader.getPath());
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reader.nextBoolean();
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assertEquals("$.a[3]", reader.getPath());
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reader.nextNull();
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assertEquals("$.a[4]", reader.getPath());
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reader.nextString();
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assertEquals("$.a[5]", reader.getPath());
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reader.beginObject();
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assertEquals("$.a[5].", reader.getPath());
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reader.nextName();
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assertEquals("$.a[5].c", reader.getPath());
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reader.nextString();
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assertEquals("$.a[5].c", reader.getPath());
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reader.endObject();
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assertEquals("$.a[5]", reader.getPath());
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reader.beginArray();
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assertEquals("$.a[5][0]", reader.getPath());
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reader.nextInt();
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assertEquals("$.a[5][1]", reader.getPath());
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reader.endArray();
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assertEquals("$.a[5]", reader.getPath());
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reader.endArray();
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assertEquals("$.a", reader.getPath());
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reader.endObject();
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assertEquals("$", reader.getPath());
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}
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public void testObjectPath() throws IOException {
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JsonReader reader = new JsonReader(new StringReader("{\"a\":1,\"b\":2}"));
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assertEquals("$", reader.getPath());
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reader.peek();
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assertEquals("$", reader.getPath());
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reader.beginObject();
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assertEquals("$.", reader.getPath());
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reader.peek();
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assertEquals("$.", reader.getPath());
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reader.nextName();
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assertEquals("$.a", reader.getPath());
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reader.peek();
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assertEquals("$.a", reader.getPath());
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reader.nextInt();
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assertEquals("$.a", reader.getPath());
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reader.peek();
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assertEquals("$.a", reader.getPath());
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reader.nextName();
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assertEquals("$.b", reader.getPath());
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reader.peek();
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assertEquals("$.b", reader.getPath());
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reader.nextInt();
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assertEquals("$.b", reader.getPath());
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reader.peek();
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assertEquals("$.b", reader.getPath());
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reader.endObject();
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assertEquals("$", reader.getPath());
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reader.peek();
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assertEquals("$", reader.getPath());
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reader.close();
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assertEquals("$", reader.getPath());
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}
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public void testArrayPath() throws IOException {
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JsonReader reader = new JsonReader(new StringReader("[1,2]"));
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assertEquals("$", reader.getPath());
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reader.peek();
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assertEquals("$", reader.getPath());
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reader.beginArray();
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assertEquals("$[0]", reader.getPath());
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reader.peek();
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assertEquals("$[0]", reader.getPath());
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reader.nextInt();
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assertEquals("$[1]", reader.getPath());
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reader.peek();
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assertEquals("$[1]", reader.getPath());
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reader.nextInt();
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assertEquals("$[2]", reader.getPath());
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reader.peek();
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assertEquals("$[2]", reader.getPath());
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reader.endArray();
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assertEquals("$", reader.getPath());
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reader.peek();
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assertEquals("$", reader.getPath());
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reader.close();
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assertEquals("$", reader.getPath());
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}
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public void testMultipleTopLevelValuesInOneDocument() throws IOException {
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JsonReader reader = new JsonReader(new StringReader("[][]"));
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reader.setLenient(true);
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reader.beginArray();
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reader.endArray();
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assertEquals("$", reader.getPath());
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reader.beginArray();
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reader.endArray();
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assertEquals("$", reader.getPath());
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}
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public void testSkipArrayElements() throws IOException {
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JsonReader reader = new JsonReader(new StringReader("[1,2,3]"));
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reader.beginArray();
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reader.skipValue();
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||||
reader.skipValue();
|
||||
assertEquals("$[2]", reader.getPath());
|
||||
}
|
||||
|
||||
public void testSkipObjectNames() throws IOException {
|
||||
JsonReader reader = new JsonReader(new StringReader("{\"a\":1}"));
|
||||
reader.beginObject();
|
||||
reader.skipValue();
|
||||
assertEquals("$.null", reader.getPath());
|
||||
}
|
||||
|
||||
public void testSkipObjectValues() throws IOException {
|
||||
JsonReader reader = new JsonReader(new StringReader("{\"a\":1,\"b\":2}"));
|
||||
reader.beginObject();
|
||||
reader.nextName();
|
||||
reader.skipValue();
|
||||
assertEquals("$.null", reader.getPath());
|
||||
reader.nextName();
|
||||
assertEquals("$.b", reader.getPath());
|
||||
}
|
||||
|
||||
public void testSkipNestedStructures() throws IOException {
|
||||
JsonReader reader = new JsonReader(new StringReader("[[1,2,3],4]"));
|
||||
reader.beginArray();
|
||||
reader.skipValue();
|
||||
assertEquals("$[1]", reader.getPath());
|
||||
}
|
||||
}
|
||||
|
|
@ -1326,45 +1326,46 @@ public final class JsonReaderTest extends TestCase {
|
|||
}
|
||||
|
||||
public void testFailWithPosition() throws IOException {
|
||||
testFailWithPosition("Expected value at line 6 column 5",
|
||||
testFailWithPosition("Expected value at line 6 column 5 path $[1]",
|
||||
"[\n\n\n\n\n\"a\",}]");
|
||||
}
|
||||
|
||||
public void testFailWithPositionGreaterThanBufferSize() throws IOException {
|
||||
String spaces = repeat(' ', 8192);
|
||||
testFailWithPosition("Expected value at line 6 column 5",
|
||||
testFailWithPosition("Expected value at line 6 column 5 path $[1]",
|
||||
"[\n\n" + spaces + "\n\n\n\"a\",}]");
|
||||
}
|
||||
|
||||
public void testFailWithPositionOverSlashSlashEndOfLineComment() throws IOException {
|
||||
testFailWithPosition("Expected value at line 5 column 6",
|
||||
testFailWithPosition("Expected value at line 5 column 6 path $[1]",
|
||||
"\n// foo\n\n//bar\r\n[\"a\",}");
|
||||
}
|
||||
|
||||
public void testFailWithPositionOverHashEndOfLineComment() throws IOException {
|
||||
testFailWithPosition("Expected value at line 5 column 6",
|
||||
testFailWithPosition("Expected value at line 5 column 6 path $[1]",
|
||||
"\n# foo\n\n#bar\r\n[\"a\",}");
|
||||
}
|
||||
|
||||
public void testFailWithPositionOverCStyleComment() throws IOException {
|
||||
testFailWithPosition("Expected value at line 6 column 12",
|
||||
testFailWithPosition("Expected value at line 6 column 12 path $[1]",
|
||||
"\n\n/* foo\n*\n*\r\nbar */[\"a\",}");
|
||||
}
|
||||
|
||||
public void testFailWithPositionOverQuotedString() throws IOException {
|
||||
testFailWithPosition("Expected value at line 5 column 3", "[\"foo\nbar\r\nbaz\n\",\n }");
|
||||
testFailWithPosition("Expected value at line 5 column 3 path $[1]",
|
||||
"[\"foo\nbar\r\nbaz\n\",\n }");
|
||||
}
|
||||
|
||||
public void testFailWithPositionOverUnquotedString() throws IOException {
|
||||
testFailWithPosition("Expected value at line 5 column 2", "[\n\nabcd\n\n,}");
|
||||
testFailWithPosition("Expected value at line 5 column 2 path $[1]", "[\n\nabcd\n\n,}");
|
||||
}
|
||||
|
||||
public void testFailWithEscapedNewlineCharacter() throws IOException {
|
||||
testFailWithPosition("Expected value at line 5 column 3", "[\n\n\"\\\n\n\",}");
|
||||
testFailWithPosition("Expected value at line 5 column 3 path $[1]", "[\n\n\"\\\n\n\",}");
|
||||
}
|
||||
|
||||
public void testFailWithPositionIsOffsetByBom() throws IOException {
|
||||
testFailWithPosition("Expected value at line 1 column 6",
|
||||
testFailWithPosition("Expected value at line 1 column 6 path $[1]",
|
||||
"\ufeff[\"a\",}]");
|
||||
}
|
||||
|
||||
|
|
@ -1394,6 +1395,23 @@ public final class JsonReaderTest extends TestCase {
|
|||
}
|
||||
}
|
||||
|
||||
public void testFailWithPositionDeepPath() throws IOException {
|
||||
JsonReader reader = new JsonReader(reader("[1,{\"a\":[2,3,}"));
|
||||
reader.beginArray();
|
||||
reader.nextInt();
|
||||
reader.beginObject();
|
||||
reader.nextName();
|
||||
reader.beginArray();
|
||||
reader.nextInt();
|
||||
reader.nextInt();
|
||||
try {
|
||||
reader.peek();
|
||||
fail();
|
||||
} catch (IOException expected) {
|
||||
assertEquals("Expected value at line 1 column 14 path $[1].a[2]", expected.getMessage());
|
||||
}
|
||||
}
|
||||
|
||||
public void testStrictVeryLongNumber() throws IOException {
|
||||
JsonReader reader = new JsonReader(reader("[0." + repeat('9', 8192) + "]"));
|
||||
reader.beginArray();
|
||||
|
|
@ -1430,6 +1448,8 @@ public final class JsonReaderTest extends TestCase {
|
|||
for (int i = 0; i < 40; i++) {
|
||||
reader.beginArray();
|
||||
}
|
||||
assertEquals("$[0][0][0][0][0][0][0][0][0][0][0][0][0][0][0][0][0][0][0][0][0][0][0][0][0][0]"
|
||||
+ "[0][0][0][0][0][0][0][0][0][0][0][0][0][0]", reader.getPath());
|
||||
for (int i = 0; i < 40; i++) {
|
||||
reader.endArray();
|
||||
}
|
||||
|
|
@ -1449,6 +1469,8 @@ public final class JsonReaderTest extends TestCase {
|
|||
reader.beginObject();
|
||||
assertEquals("a", reader.nextName());
|
||||
}
|
||||
assertEquals("$.a.a.a.a.a.a.a.a.a.a.a.a.a.a.a.a.a.a.a.a"
|
||||
+ ".a.a.a.a.a.a.a.a.a.a.a.a.a.a.a.a.a.a.a.a", reader.getPath());
|
||||
assertEquals(true, reader.nextBoolean());
|
||||
for (int i = 0; i < 40; i++) {
|
||||
reader.endObject();
|
||||
|
|
|
|||
Loading…
Reference in New Issue
Block a user