// Copyright 2015 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

"use strict";

class DisassemblyView extends TextView {
  constructor(id, broker, sortedPositionList) {
    super(id, broker, null, false);
    this.pos_start = -1;
    this.pos_lines = null;
    let view = this;
    let ADDRESS_STYLE = {
      css: 'tag',
      location: function(text) {
        ADDRESS_STYLE.last_address = text;
        return undefined;
      }
    };
    let ADDRESS_LINK_STYLE = {
      css: 'tag',
      link: function(text) {
        view.select(function(location) { return location.address == text; }, true, true);
      }
    };
    let UNCLASSIFIED_STYLE = {
      css: 'com'
    };
    let NUMBER_STYLE = {
      css: 'lit'
    };
    let COMMENT_STYLE = {
      css: 'com'
    };
    let POSITION_STYLE = {
      css: 'com',
      location: function(text) {
        view.pos_start = Number(text);
      }
    };
    let OPCODE_STYLE = {
      css: 'kwd',
      location: function(text) {
        return {
          address: ADDRESS_STYLE.last_address
        };
      }
    };
    const BLOCK_HEADER_STYLE = {
      css: 'com',
      block_id: -1,
      location: function(text) {
        let matches = /\d+/.exec(text);
        if (!matches) return undefined;
        BLOCK_HEADER_STYLE.block_id = Number(matches[0]);
        return {
          block_id: BLOCK_HEADER_STYLE.block_id
        };
      },
    };
    const SOURCE_POSITION_HEADER_STYLE = {
      css: 'com',
      location: function(text) {
        let matches = /(\d+):(\d+)/.exec(text);
        if (!matches) return undefined;
        let li = Number(matches[1]);
        if (view.pos_lines === null) return undefined;
        let pos = view.pos_lines[li-1] + Number(matches[2]);
        return {
          pos_start: pos,
          pos_end: pos + 1
        };
      },
    };
    view.SOURCE_POSITION_HEADER_REGEX = /^(\s*-- .+:)(\d+:\d+)( --)/;
    let patterns = [
      [
        [/^0x[0-9a-f]{8,16}/, ADDRESS_STYLE, 1],
        [view.SOURCE_POSITION_HEADER_REGEX, SOURCE_POSITION_HEADER_STYLE, -1],
        [/^\s+-- B\d+ start.*/, BLOCK_HEADER_STYLE, -1],
        [/^.*/, UNCLASSIFIED_STYLE, -1]
      ],
      [
        [/^\s+\d+\s+[0-9a-f]+\s+/, NUMBER_STYLE, 2],
        [/^.*/, null, -1]
      ],
      [
        [/^\S+\s+/, OPCODE_STYLE, 3],
        [/^\S+$/, OPCODE_STYLE, -1],
        [/^.*/, null, -1]
      ],
      [
        [/^\s+/, null],
        [/^[^\(;]+$/, null, -1],
        [/^[^\(;]+/, null],
        [/^\(/, null, 4],
        [/^;/, COMMENT_STYLE, 5]
      ],
      [
        [/^0x[0-9a-f]{8,16}/, ADDRESS_LINK_STYLE],
        [/^[^\)]/, null],
        [/^\)$/, null, -1],
        [/^\)/, null, 3]
      ],
      [
        [/^; debug\: position /, COMMENT_STYLE, 6],
        [/^.+$/, COMMENT_STYLE, -1]
      ],
      [
        [/^\d+$/, POSITION_STYLE, -1],
      ]
    ];
    view.setPatterns(patterns);
  }

  lineLocation(li) {
    let view = this;
    let result = undefined;
    for (let i = 0; i < li.children.length; ++i) {
      let fragment = li.children[i];
      let location = fragment.location;
      if (location != null) {
        if (location.block_id != undefined) {
          if (result === undefined) result = {};
          result.block_id = location.block_id;
        }
        if (location.address != undefined) {
          if (result === undefined) result = {};
          result.address = location.address;
        }
        if (location.pos_start != undefined && location.pos_end != undefined) {
          if (result === undefined) result = {};
          result.pos_start = location.pos_start;
          result.pos_end = location.pos_end;
        }
        else if (view.pos_start != -1) {
          if (result === undefined) result = {};
          result.pos_start = view.pos_start;
          result.pos_end = result.pos_start + 1;
        }
      }
    }
    return result;
  }

  initializeCode(sourceText, sourcePosition) {
    let view = this;
    view.pos_lines = new Array();
    // Comment lines for line 0 include sourcePosition already, only need to
    // add sourcePosition for lines > 0.
    view.pos_lines[0] = sourcePosition;
    if (sourceText != "") {
      let base = sourcePosition;
      let current = 0;
      let source_lines = sourceText.split("\n");
      for (i=1; i < source_lines.length; i++) {
        // Add 1 for newline character that is split off.
        current += source_lines[i-1].length + 1;
        view.pos_lines[i] = base + current;
      }
    }
  }

  processLine(line) {
    let view = this;
    let func = function(match, p1, p2, p3) {
      let nums = p2.split(":");
      let li = Number(nums[0]);
      let pos = Number(nums[1]);
      if(li === 0)
        pos -= view.pos_lines[0];
      li++;
      return p1 + li + ":" + pos + p3;
    };
    line = line.replace(view.SOURCE_POSITION_HEADER_REGEX, func);
    let fragments = super.processLine(line);
    return fragments;
  }
}